1. Dart
2. dart:html
3. VRSession
4. onFocus property

VRSession class

1. Properties
2. depthFar
3. depthNear
4. device
5. exclusive
6. onBlur
7. onFocus
8. hashCode
9. on
10. runtimeType
11. Methods
12. end
13. requestFrameOfReference
14. addEventListener
15. dispatchEvent
16. noSuchMethod
17. removeEventListener
18. toString
19. Operators
20. operator ==
21. Constants
22. blurEvent
23. focusEvent

Stream<Event> get onFocus => focusEvent.forTarget(this);